the turbo isn't smoking because its "bad" there is something to do with seals and back pressure and stock turbos I'm not 100% about the details but if you search you will find the answer its something along the lines of the reasons i just mentioned...
I'm going to go ahead and assume the block is think enough that rust won't be a problem for awhile but...im no expert
also I'm doing a over haul build and i have a bunch of parts for sale if you are looking for some pretty sweet stuff for a good deal lmk!
I'm new here so if I'm breaking the rules here lmk, i have a tip and sri 3.25in from cp-e for a mazdaspeed6 if you want i have some pictures and can take the picture to follow the read if you think you re interested lmk!